Am 23.09.2012 14:35, schrieb Андрей Клаус:
> About domain name - the thing is that right now i see exactly the next
> message (except ip address) "Received: from mail.localdomain
> ([ip.add.re.ss]) by mx.google.com..". And "mail.localdomain" is a
> local alias.

Reveived is generated from DNS and not from any postfix config
it has even nothing to do with the first hop
as the name RECEIVED says it is added by the receiver

> So, it cant be resolved from external network. 

who cares?

it is a LOCAL machine
what and why should any WAN server resolve here?

> So, it cant depend from real ip address. So, only postfix can say to
> mx.google.com that postfixbox is "mail.localdomain".

postfix does not say anything

mx.google.com is not interested in your received
hesder froma  local hop and is adding his own with
the PTR of your ip-address

your postfix configuration is not involved in this game

> And i think postfix says it's $myhostname here.

but you are wrong

> I understand that it is really not  a big thing, but i just would 
> like to use respective domain names for this, if there is a way

so configure your DNS server

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